:root {
    --position-ink: #12283b;
    --position-blue: #0b668f;
    --position-cyan: #29b8c7;
    --position-gold: #bd8650;
    --position-muted: #64798a;
    --position-line: #d7e3e8;
    --position-paper: #f4f8fa;
    --position-navy: #071d32;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 110px;
}

body.positioning-page {
    margin: 0;
    color: var(--position-ink);
    background: var(--position-paper);
    font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

.positioning-page *,
.positioning-page *::before,
.positioning-page *::after {
    box-sizing: border-box;
}

.positioning-shell {
    width: min(1180px, calc(100% - 48px));
    margin-inline: auto;
}

.positioning-hero {
    position: relative;
    overflow: hidden;
    padding: 150px 0 84px;
    color: #fff;
    background:
        radial-gradient(circle at 78% 20%, rgba(41, 184, 199, .18), transparent 34%),
        linear-gradient(135deg, #06182b 0%, #0a2f4a 100%);
}

.positioning-hero::after {
    position: absolute;
    right: -10%;
    bottom: -180px;
    width: 620px;
    height: 620px;
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: 50%;
    content: "";
}

.positioning-hero__inner {
    position: relative;
    z-index: 1;
}

.positioning-hero h1 {
    max-width: 1060px;
    margin: 0;
    font-family: "Noto Serif SC", serif;
    font-size: clamp(2.5rem, 5vw, 4.65rem);
    font-weight: 700;
    line-height: 1.22;
    letter-spacing: -.035em;
}

.positioning-subtitle {
    max-width: 720px;
    margin: 28px 0 0;
    color: rgba(255, 255, 255, .72);
    font-size: clamp(1.05rem, 1.8vw, 1.28rem);
    letter-spacing: .06em;
}

.positioning-opening {
    padding: 84px 0;
    background: #fff;
}

.positioning-opening__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.06fr) minmax(420px, .94fr);
    gap: 72px;
    align-items: center;
}

.positioning-section-label {
    margin: 0 0 18px;
    color: var(--position-gold);
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: .2em;
}

.positioning-opening h2 {
    margin: 0 0 26px;
    font-family: "Noto Serif SC", serif;
    font-size: clamp(2rem, 3.5vw, 3rem);
    line-height: 1.35;
}

.positioning-opening__copy > p:not(.positioning-section-label) {
    margin: 14px 0 0;
    color: var(--position-muted);
    font-size: 1.02rem;
    line-height: 1.95;
}

.foundation-map {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.foundation-card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 265px;
    padding: 30px 28px 26px;
    color: #fff;
    background: var(--position-blue);
}

.foundation-card--technical {
    background: var(--position-navy);
}

.foundation-card__code {
    display: inline-block;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--position-cyan);
    color: rgba(255, 255, 255, .68);
    font-size: .76rem;
    font-weight: 700;
    letter-spacing: .18em;
}

.foundation-card h3 {
    margin: 26px 0 12px;
    font-family: "Noto Serif SC", serif;
    font-size: 1.65rem;
}

.foundation-card p {
    margin: 0;
    color: rgba(255, 255, 255, .74);
    font-size: .9rem;
    line-height: 1.75;
}

.foundation-card strong {
    align-self: flex-end;
    margin-top: auto;
    padding-top: 18px;
    color: #fff;
    font-size: .86rem;
}

.foundation-map__note {
    grid-column: 1 / -1;
    margin: 2px 0 0;
    padding: 14px 18px;
    color: var(--position-muted);
    background: #edf4f6;
    font-size: .8rem;
    font-weight: 600;
    letter-spacing: .16em;
    text-align: center;
}

.positioning-layout {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 72px;
    padding-top: 88px;
    padding-bottom: 110px;
}

.positioning-toc__inner {
    position: sticky;
    top: 104px;
    padding: 28px 0 26px;
    border-top: 3px solid var(--position-cyan);
    border-bottom: 1px solid var(--position-line);
}

.positioning-toc h2 {
    margin: 0 0 15px;
    font-size: 1.15rem;
}

.positioning-toc ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

.positioning-toc a {
    position: relative;
    display: flex;
    gap: 13px;
    align-items: center;
    padding: 10px 9px;
    color: #7e91a2;
    font-size: .93rem;
    text-decoration: none;
    transition: color .2s ease, background .2s ease, transform .2s ease;
}

.positioning-toc a::before {
    position: absolute;
    top: 12px;
    bottom: 12px;
    left: -1px;
    width: 2px;
    background: transparent;
    content: "";
}

.positioning-toc a span {
    min-width: 22px;
    color: #9fb0bd;
    font-size: .72rem;
}

.positioning-toc a:hover,
.positioning-toc a:focus-visible {
    color: var(--position-blue);
}

.positioning-toc a.is-active {
    color: var(--position-blue);
    background: rgba(41, 184, 199, .08);
    font-weight: 700;
    transform: translateX(5px);
}

.positioning-toc a.is-active::before {
    background: var(--position-cyan);
}

.positioning-toc a.is-active span {
    color: var(--position-cyan);
}

.positioning-article {
    min-width: 0;
}

.positioning-lead {
    margin-bottom: 78px;
    padding: 34px 38px;
    border-left: 4px solid var(--position-cyan);
    background: #fff;
    box-shadow: 0 18px 50px rgba(17, 50, 70, .06);
}

.positioning-lead p {
    margin: 0;
    font-family: "Noto Serif SC", serif;
    font-size: 1.08rem;
    line-height: 1.95;
}

.positioning-lead p + p {
    margin-top: 15px;
}

.article-section {
    margin-bottom: 98px;
}

.article-section__number {
    display: block;
    margin-bottom: 8px;
    color: var(--position-cyan);
    font-size: .83rem;
    font-weight: 700;
    letter-spacing: .2em;
}

.article-section > h2 {
    margin: 0 0 38px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--position-line);
    font-family: "Noto Serif SC", serif;
    font-size: clamp(2rem, 3.2vw, 2.85rem);
    line-height: 1.3;
}

.article-section h3 {
    margin: 44px 0 17px;
    color: var(--position-blue);
    font-size: 1.28rem;
    line-height: 1.55;
}

.article-section > p,
.article-section > ul {
    color: #42596a;
    font-size: 1rem;
    line-height: 2;
}

.article-section > p {
    margin: 16px 0;
}

.article-section > ul {
    margin: 18px 0 24px;
    padding-left: 1.35em;
}

.article-section > ul li {
    padding-left: .35em;
}

.positioning-table-wrap {
    overflow-x: auto;
    margin-bottom: 46px;
    border: 1px solid var(--position-line);
    background: #fff;
}

.positioning-table-wrap table {
    width: 100%;
    min-width: 660px;
    border-collapse: collapse;
}

.positioning-table-wrap th,
.positioning-table-wrap td {
    padding: 19px 20px;
    border-right: 1px solid var(--position-line);
    border-bottom: 1px solid var(--position-line);
    text-align: left;
    vertical-align: top;
}

.positioning-table-wrap th:last-child,
.positioning-table-wrap td:last-child {
    border-right: 0;
}

.positioning-table-wrap tr:last-child td {
    border-bottom: 0;
}

.positioning-table-wrap th {
    color: #fff;
    background: var(--position-navy);
    font-size: .84rem;
    letter-spacing: .08em;
}

.positioning-table-wrap td {
    color: #506777;
    line-height: 1.65;
}

.article-boundary {
    margin-top: 34px;
    padding: 28px 30px;
    border: 1px solid #d4e2e8;
    border-top: 3px solid var(--position-gold);
    background: #fff;
}

.article-boundary > strong {
    display: block;
    margin-bottom: 12px;
    color: var(--position-gold);
    font-size: .82rem;
    letter-spacing: .15em;
}

.article-boundary p {
    margin: 10px 0 0;
    color: #607383;
    font-size: .92rem;
    line-height: 1.85;
}

.core-system {
    margin-top: 26px;
    padding: 34px 36px;
    border-top: 4px solid var(--position-blue);
    background: #fff;
    box-shadow: 0 14px 38px rgba(17, 50, 70, .05);
}

.core-system--wsit {
    border-top-color: var(--position-cyan);
}

.core-system__heading {
    display: flex;
    gap: 18px;
    align-items: center;
    margin-bottom: 24px;
}

.core-system__heading span {
    padding: 7px 10px;
    color: #fff;
    background: var(--position-blue);
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: .12em;
}

.core-system--wsit .core-system__heading span {
    color: var(--position-navy);
    background: var(--position-cyan);
}

.core-system .core-system__heading h3 {
    margin: 0;
    color: var(--position-ink);
    font-family: "Noto Serif SC", serif;
    font-size: 1.55rem;
}

.core-system p,
.core-system ul {
    color: #506777;
    line-height: 1.9;
}

.core-tag-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin: 24px 0;
}

.core-tag-grid span {
    display: flex;
    min-height: 64px;
    align-items: center;
    justify-content: center;
    padding: 11px;
    color: var(--position-blue);
    background: #edf6f8;
    font-size: .88rem;
    font-weight: 600;
    text-align: center;
}

.core-system__answer {
    margin-bottom: 0;
    color: var(--position-ink) !important;
    font-weight: 700;
}

.article-section blockquote {
    margin: 34px 0 28px;
    padding: 30px 36px;
    color: #fff;
    background: linear-gradient(120deg, var(--position-blue), #094a6b);
    font-family: "Noto Serif SC", serif;
    font-size: 1.25rem;
    line-height: 1.75;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.value-grid article {
    padding: 30px;
    border: 1px solid var(--position-line);
    background: #fff;
}

.value-grid article:last-child {
    grid-column: 1 / -1;
}

.value-grid article > span {
    color: var(--position-cyan);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .16em;
}

.value-grid article h3 {
    margin: 15px 0 12px;
    color: var(--position-ink);
    font-family: "Noto Serif SC", serif;
    font-size: 1.16rem;
}

.value-grid article p {
    margin: 0;
    color: #607383;
    font-size: .92rem;
    line-height: 1.8;
}

.progress-list {
    margin-bottom: 28px;
    border-top: 1px solid var(--position-line);
}

.progress-list > div {
    display: grid;
    grid-template-columns: 72px 1fr auto;
    gap: 22px;
    align-items: center;
    min-height: 110px;
    border-bottom: 1px solid var(--position-line);
}

.progress-list__mark {
    color: var(--position-blue);
    font-size: .86rem;
    font-weight: 700;
    letter-spacing: .1em;
}

.progress-list strong {
    display: block;
    margin-bottom: 6px;
    font-size: 1.02rem;
}

.progress-list p {
    margin: 0;
    color: var(--position-muted);
    font-size: .84rem;
}

.progress-list__status {
    padding: 7px 12px;
    color: #8a6637;
    background: #f5eadc;
    font-size: .76rem;
    font-weight: 700;
}

.progress-list__status--done {
    color: #257c65;
    background: #ddf2eb;
}

.use-steps {
    margin-bottom: 34px;
}

.use-steps article {
    display: grid;
    grid-template-columns: 58px 1fr;
    gap: 23px;
    align-items: start;
    padding: 25px 0;
    border-bottom: 1px solid var(--position-line);
}

.use-steps article > span {
    display: grid;
    width: 48px;
    height: 48px;
    place-items: center;
    color: #fff;
    background: var(--position-blue);
    font-size: .85rem;
    font-weight: 700;
}

.use-steps h3 {
    margin: 1px 0 8px;
    color: var(--position-ink);
    font-size: 1.08rem;
}

.use-steps p {
    margin: 0;
    color: var(--position-muted);
    line-height: 1.75;
}

.article-section--conclusion {
    padding: 45px 48px;
    color: #fff;
    background: var(--position-navy);
}

.article-section--conclusion .article-section__number {
    color: var(--position-cyan);
}

.article-section--conclusion > h2 {
    margin-bottom: 26px;
    border-bottom-color: rgba(255, 255, 255, .17);
}

.article-section--conclusion > p {
    color: rgba(255, 255, 255, .78);
}

.article-section--conclusion > p strong {
    color: #fff;
}

.positioning-disclaimer {
    padding-top: 26px;
    border-top: 1px solid var(--position-line);
    color: #7c8d99;
    font-size: .82rem;
    line-height: 1.75;
}

.positioning-disclaimer strong {
    color: var(--position-ink);
}

.positioning-disclaimer p {
    margin: 6px 0 0;
}

@media (max-width: 960px) {
    .positioning-opening__grid {
        grid-template-columns: 1fr;
        gap: 45px;
    }

    .positioning-layout {
        grid-template-columns: 1fr;
        gap: 45px;
        padding-top: 64px;
    }

    .positioning-toc__inner {
        position: static;
    }

    .positioning-toc ol {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 4px;
    }
}

@media (max-width: 700px) {
    .positioning-shell {
        width: min(100% - 32px, 1180px);
    }

    .positioning-hero {
        padding: 122px 0 62px;
    }

    .positioning-hero h1 {
        font-size: 2.25rem;
    }

    .positioning-opening {
        padding: 60px 0;
    }

    .foundation-map,
    .value-grid,
    .core-tag-grid {
        grid-template-columns: 1fr;
    }

    .value-grid article:last-child {
        grid-column: auto;
    }

    .foundation-card {
        min-height: 235px;
    }

    .positioning-toc ol {
        grid-template-columns: repeat(2, 1fr);
    }

    .positioning-lead,
    .core-system {
        padding: 26px 24px;
    }

    .article-section {
        margin-bottom: 72px;
    }

    .progress-list > div {
        grid-template-columns: 58px 1fr;
        gap: 12px;
        padding: 22px 0;
    }

    .progress-list__status {
        grid-column: 2;
        justify-self: start;
    }

    .article-section--conclusion {
        padding: 34px 26px;
    }
}

@media (max-width: 420px) {
    .positioning-hero h1 {
        font-size: 1.95rem;
    }

    .positioning-toc ol {
        grid-template-columns: 1fr;
    }

    .positioning-layout {
        padding-bottom: 78px;
    }
}

@media print {
    .positioning-toc,
    #nav-placeholder,
    #footer-placeholder {
        display: none !important;
    }

    .positioning-layout {
        display: block;
    }

    .positioning-hero,
    .article-section--conclusion,
    .article-section blockquote {
        color: #000;
        background: #fff;
    }
}